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m in (-oo:+oo)
4/12 = (2*m)/12 // - (2*m)/12
4/12-((2*m)/12) = 0
(-1/6)*m+4/12 = 0
1/3-1/6*m = 0 // - 1/3
-1/6*m = -1/3 // : -1/6
m = -1/3/(-1/6)
m = 2
m = 2
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